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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS Part 12 (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
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Pension Plans [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | $ 345,443 |  | $ 274,130 |  | $ 247,959
Derivative Assets, fair value measurements | 4,186 |  | 3,027 |  |
Cash margin payable | 5,480 |  | 2,750 |  |
Pension Plans [Member] | Cash and cash equivalents [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 18,177 |  | 57,614 |  |
Pension Plans [Member] | Stock/Bond mutual fund [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 115,817 |  |  |  |
Pension Plans [Member] | U.S. bond mutual funds [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 17,682 |  | 36,767 |  |
Pension Plans [Member] | U.S. government [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 55,743 |  | 57,925 |  |
Pension Plans [Member] | U.S. corporate [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 110,925 |  | 93,169 |  |
Pension Plans [Member] | U.S. municipal [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 6,799 |  | 9,493 |  |
Pension Plans [Member] | International [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 21,594 |  | 18,885 |  |
Pension Plans [Member] | Derivative instrument [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | (1,294) | [1] | 277 | [2] |
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 35,859 |  | 94,381 |  |
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Cash and cash equivalents [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 18,177 |  | 57,614 |  |
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] | U.S. bond mutual funds [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 17,682 |  | 36,767 |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 309,584 |  | 179,749 |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | Stock/Bond mutual fund [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 115,817 |  |  |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | U.S. government [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 55,743 |  | 57,925 |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | U.S. corporate [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 110,925 |  | 93,169 |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | U.S. municipal [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 6,799 |  | 9,493 |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | International [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 21,594 |  | 18,885 |  |
Pension Plans [Member] | Significant Observable Inputs (Level 2) [Member] | Derivative instrument [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | (1,294) | [1] | 277 | [2] |
Postretirement Plans [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 111,645 |  | 67,442 |  | 51,744
Postretirement Plans [Member] | Cash and cash equivalents [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 1,411 |  | 1,106 |  |
Postretirement Plans [Member] | Stock/Bond mutual fund [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 110,234 |  | 66,336 |  |
Postretirement Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 111,645 |  | 67,442 |  |
Postretirement Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Cash and cash equivalents [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | 1,411 |  | 1,106 |  |
Postretirement Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Stock/Bond mutual fund [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair value measurements of plan assets | $ 110,234 |  | $ 66,336 |  |
[1] | Derivative assets of $4,186 net of cash margin payable of $5,480.
[2] | Derivative assets of $3,027 net of cash margin payable of $2,750.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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